fix(dashboard): preserve notes summary freshness

[Vann-Dev]

Summary

• stop the dashboard Notes queue from falling back null summaryUpdatedAt to taskUpdatedAt for unread filtering or UI payloads
• remove the mark-reviewed action backfill that mutated summaryUpdatedAt from taskUpdatedAt
• add a focused dashboard read-state helper/test so null summary freshness stays unread and stored summary freshness drives read comparisons

Checks

• corepack pnpm test:api
• corepack pnpm lint
• DATABASE_URL=postgresql://postgres:postgres@localhost:5432/agentbridge?schema=public AUTH_SECRET=local-placeholder-auth-secret corepack pnpm typecheck
• DATABASE_URL=postgresql://postgres:postgres@localhost:5432/agentbridge?schema=public AUTH_SECRET=local-placeholder-auth-secret NEXT_TELEMETRY_DISABLED=1 corepack pnpm build

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Project	Deployment	Actions	Updated (UTC)
agent-bridge-web	Ready	Preview, Comment	May 16, 2026 0:56am